I suppose many of you may know the famous nightmare some people had with the F150 eco-boost trucks, right? Long story short under some very unique conditions, water condensation would build up in the intercooler and then the engine would ingest it and it would cause the engine to shake violently and fall flat on its face. The trouble was 1) that water formed in the first place and; 2) to ingest it, you would have to be in pretty good boost. It happened to me one time. I was in a rainstorm towing a trailer from LA to Las Vegas. About 3 hours into the trip - driving rain all the way, we stopped briefly in Baker for fuel and some fast food. When we were leaving Baker on the back road toward Death Valley, I pulled out to pass a slow moving vehicle. The truck fell flat on its face, shook like hell, (felt like a transmission issue) and I couldn't accelerate. I few seconds later it was fine. A change of underwear later I realized what had happened as quite a few folks had written about it and it took Ford awhile to understand the cause.
With the RS, I feel like there are some VERY UNIQUE situations where the same thing could occur. 99.9% of the rest of the time, the added efficiency of the WHOLE intercooler is going to help you. Being in dry, Southern California, I don't feel I'm taking any risk at all.